基于PMF的伪码捕获改进算法

摘要

In order to reduce the probability of false positive Doppler frequency caused by the correlation peak blur , an improved algorithm based on the matched filter in the original ( PMF) algorithm was presented , by using overlapping improvements accumulated correlation value in the peak correlation length , and changing a two -dimensional search of the tradi-tional frequency -pseudo -code into one dimensional search , time was exponentially re-duced and has greater advantage in the field of space telemetry .The simulation results showed that the improved algorithm effectively improves the capture probability and improved anti-jamming performance of system in the premise without loss of capture speed and in-crease of resource consumption .This algorithm was verified in FPGA , and it was a fast and efficient pseudo-code direct acquisition algorithm .%为减小由相关峰值模糊造成多普勒频率误判的概率，提出一种在原有匹配滤波（ PMF ）算法基础上的改进算法，通过利用相关值的重叠累积改进相关长度内的相关峰值，并变传统的频率—伪码二维搜索为伪码的一维搜索，极大地缩短了时间，在空间遥测领域有较大的优势。仿真结果表明，改进算法在不损失捕获速度和不增加资源消耗的前提下有效地提高了捕获概率、改善了系统的抗干扰性能。且此算法已在FPGA上验证通过，是一种快速高效的伪码直接捕获算法。